The digits 1, 2, 3, 4, 6, 7, 8, and 9 are used to form four two-digit prime numbers. If each digit is used only once, find the sum of the four two-digit prime numbers.Source: mathcontest.olemiss.edu 11/17/2008

One Response to Two Digit Primes

For all those that are improving their math skills, I think that it is important to note that since you could only use 1,3,7, and 9 in the ones-digit and 2,4,6, and 8 in the tens-digit, no matter how you formed the prime numbers, the sum would be the same. Of course, this would be the case even if you just stated that the numbers had to be odd (instead of prime).